A preparation method of polypyrrole/silver surface modified layered clay-polycaprolactone antibacterial nanocomposite film

Abstract

The invention provides a preparation method of polypyrrole / silver surface modified layered clay-polycaprolactone antibacterial nanocomposite film. + Salt-induced chemical oxidation of pyrrole Py on the surface of layered clay LDHs, the chemical oxidation of newly formed PPy can combine and reduce silver ions into metallic silver nanoparticles AgNP, and then form polypyrrole PPy-coated clay LDHs to obtain polypyrrole surface modification Layered clay antibacterial powder LDHs@PPy‑Ag; finally, LDHs@PPy‑Ag / PCL nanocomposite films were prepared by solution casting of LDHs@PPy‑Ag and polycaprolactone PCL. The invention increases the interface compatibility and bonding force between LDHs and the substrate PCL through the surface organic coating PPy, improves the mechanical properties and gas barrier properties of the final nanocomposite material, and endows the composite film with excellent antibacterial properties, and finally expands the composite film. The application of the material in the field of active packaging has the advantages of simple preparation method and easy control of conditions, and is suitable for large-scale production.

Description

technical field

[0001] The invention relates to a preparation method of polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, relates to the technical field of polymer materials, in particular to the field of active packaging application. Background technique

[0002] Among the high-performance environment-friendly degradable plastics, aliphatic polyester is one of the most promising polymer materials at present. Polycaprolactone (PCL), as an aliphatic polyester with good application potential, is derived from the ring-opening polymerization of ε-caprolactone (ε-CL), and has been widely used in food and healthcare product packaging and agricultural films. Wider range of applications. Although PCL is the most biodegradable synthetic aliphatic polyester, its poor structural and functional stability hinders its production and application, especially the urgent need for higher barrier and antibacterial properties.

[0003] Layered ...

Examples

Embodiment 1

[0042] This example provides a method for preparing a polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, which is prepared according to the following steps.

[0043] 1) Preparation of LDHs@PPy-Ag

[0044] Weigh 0.05g LDHs and disperse in 50mL deionized H 2O, ultrasonic stirring for 30min to obtain 0.5g / L LDHs dispersion. Then weigh 0.12g AgNO3 and dissolve it in the LDHs dispersion, stir ultrasonically for 5min, then magnetically stir, adsorb for 30min, and heat up to 70°C. Then 1.2 g of Py was added to 50 mL of deionized H 2 In O, sonicate for 10 min until Py is completely dissolved. Finally, the Py aqueous solution was added to the LDHs dispersion, stirred by magnetic force for 60 min, and the temperature was 70°C. The reaction liquid began to gradually turn black. After the reaction was completed, it was centrifuged three times and then freeze-dried to obtain black LDHs@PPy-Ag powder.

[0045] 2) Preparation of LDHs@PPy-...

Embodiment 2

[0049] This example provides a method for preparing a polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, which is prepared according to the following steps.

[0050] 1) Preparation of LDHs@PPy-Ag

[0051] Weigh 0.05g LDHs and disperse in 50mL deionized H 2 O, ultrasonic stirring for 30min to obtain 0.5g / L LDHs dispersion. Then weigh 0.05g AgNO3 and dissolve it in the LDHs dispersion, stir ultrasonically for 5min, then magnetically stir, adsorb for 20min, and heat up to 60°C. Then 1.0 g of Py was added to 50 mL of deionized H 2 O, sonicate for 5 min until Py is completely dissolved. Finally, the Py aqueous solution was added to the LDHs dispersion, stirred by magnetic force for 120 minutes, and the temperature was 60°C, and the reaction solution began to gradually turn black. After the reaction was completed, it was centrifuged three times and then freeze-dried to obtain black LDHs@PPy-Ag powder.

[0052] 2) Preparation of L...

Embodiment 3

[0055] This example provides a method for preparing a polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, which is prepared according to the following steps.

[0056] 1) Preparation of LDHs@PPy-Ag

[0057] Weigh 0.05g LDHs and disperse in 50mL deionized H 2 O, ultrasonic stirring for 30min to obtain 0.5g / L LDHs dispersion. Then weigh 0.075g AgNO3 and dissolve it in the LDHs dispersion, stir ultrasonically for 5min, then magnetically stir, adsorb for 30min, and heat up to 80°C. Then measure 0.375g Py into 50mL of deionized H 2 O, sonicate for 20 min until Py is completely dissolved. Finally, the Py aqueous solution was added to the LDHs dispersion, stirred by magnetic force for 200 min, and the temperature was 80°C, and the reaction liquid began to gradually turn black. After the reaction was finished, it was centrifuged and washed five times, and then freeze-dried to obtain black LDHs@PPy-Ag powder.

[0058] 2) Preparation o...

technical field

[0001] The invention relates to a preparation method of polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, relates to the technical field of polymer materials, in particular to the field of active packaging application. Background technique

[0002] Among the high-performance environment-friendly degradable plastics, aliphatic polyester is one of the most promising polymer materials at present. Polycaprolactone (PCL), as an aliphatic polyester with good application potential, is derived from the ring-opening polymerization of ε-caprolactone (ε-CL), and has been widely used in food and healthcare product packaging and agricultural films. Wider range of applications. Although PCL is the most biodegradable synthetic aliphatic polyester, its poor structural and functional stability hinders its production and application, especially the urgent need for higher barrier and antibacterial properties.

[0003] Layered ...

Examples

Embodiment 1

[0042] This example provides a method for preparing a polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, which is prepared according to the following steps.

[0043] 1) Preparation of LDHs@PPy-Ag

[0044] Weigh 0.05g LDHs and disperse in 50mL deionized H 2O, ultrasonic stirring for 30min to obtain 0.5g / L LDHs dispersion. Then weigh 0.12g AgNO3 and dissolve it in the LDHs dispersion, stir ultrasonically for 5min, then magnetically stir, adsorb for 30min, and heat up to 70°C. Then 1.2 g of Py was added to 50 mL of deionized H 2 In O, sonicate for 10 min until Py is completely dissolved. Finally, the Py aqueous solution was added to the LDHs dispersion, stirred by magnetic force for 60 min, and the temperature was 70°C. The reaction liquid began to gradually turn black. After the reaction was completed, it was centrifuged three times and then freeze-dried to obtain black LDHs@PPy-Ag powder.

[0045] 2) Preparation of LDHs@PPy-...

Embodiment 2

[0049] This example provides a method for preparing a polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, which is prepared according to the following steps.

[0050] 1) Preparation of LDHs@PPy-Ag

[0051] Weigh 0.05g LDHs and disperse in 50mL deionized H 2 O, ultrasonic stirring for 30min to obtain 0.5g / L LDHs dispersion. Then weigh 0.05g AgNO3 and dissolve it in the LDHs dispersion, stir ultrasonically for 5min, then magnetically stir, adsorb for 20min, and heat up to 60°C. Then 1.0 g of Py was added to 50 mL of deionized H 2 O, sonicate for 5 min until Py is completely dissolved. Finally, the Py aqueous solution was added to the LDHs dispersion, stirred by magnetic force for 120 minutes, and the temperature was 60°C, and the reaction solution began to gradually turn black. After the reaction was completed, it was centrifuged three times and then freeze-dried to obtain black LDHs@PPy-Ag powder.

[0052] 2) Preparation of L...

Embodiment 3

[0055] This example provides a method for preparing a polypyrrole / silver surface-modified layered clay-polycaprolactone antibacterial nanocomposite film, which is prepared according to the following steps.

[0056] 1) Preparation of LDHs@PPy-Ag

[0057] Weigh 0.05g LDHs and disperse in 50mL deionized H 2 O, ultrasonic stirring for 30min to obtain 0.5g / L LDHs dispersion. Then weigh 0.075g AgNO3 and dissolve it in the LDHs dispersion, stir ultrasonically for 5min, then magnetically stir, adsorb for 30min, and heat up to 80°C. Then measure 0.375g Py into 50mL of deionized H 2 O, sonicate for 20 min until Py is completely dissolved. Finally, the Py aqueous solution was added to the LDHs dispersion, stirred by magnetic force for 200 min, and the temperature was 80°C, and the reaction liquid began to gradually turn black. After the reaction was finished, it was centrifuged and washed five times, and then freeze-dried to obtain black LDHs@PPy-Ag powder.

[0058] 2) Preparation o...

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